Analog Devices Inc. ADF7011BRU-REEL7

Overview

ADF7011BRU-REEL7 from Analog Devices is a single-chip, low-power UHF ASK/FSK/GFSK transmitter IC operating in 433–435 MHz and 868–870 MHz ISM bands. It integrates a fractional-N PLL, on-chip VCO, and programmable PA delivering –16 dBm to +12 dBm output power in 0.3125 dB steps, supporting data rates up to 76.8 kbps for wireless metering and remote security systems.

For engineers reviewing the ADF7011BRU-REEL7 datasheet, ADF7011BRU-REEL7 pinout, ADF7011BRU-REEL7 application, or ADF7011BRU-REEL7 equivalent, key selection criteria include its 24-pin TSSOP package, 2.3–3.6 V supply range, 3-wire serial interface, ETSI-compliant spurious performance, and support for crystal compensation with ±1 ppm resolution.

Technical Context

The ADF7011BRU-REEL7 implements a Σ-Δ fractional-N PLL architecture with dual-modulus prescaler (8/9 or 4/5), enabling precise channel spacing and frequency hopping across both European SRD bands. Its VCO gain is 40 MHz/V at 433 MHz and 80 MHz/V at 868 MHz, with phase noise of –81 dBc/Hz @ 5 kHz offset (433 MHz) and –83 dBc/Hz @ 5 kHz offset (868 MHz).

Modulation is selected via register-controlled schemes: FSK/GFSK (0.3–76.8 kbps), ASK (0.3–9.6 kbps), or OOK (40 dB depth). The 3-wire serial interface (CLK, DATA, LE) programs four 24-bit registers; CLKOUT provides a divided reference clock (default ÷16), and MUXOUT supports debug via digital lock detect or scaled RF/reference outputs.

Key Specifications

Pinout & Package

ADF7011BRU-REEL7 is housed in a 24-lead TSSOP (RU-24) package with exposed pad for thermal management. Pin functions are validated per Analog Devices' official datasheet Rev. 0, including dedicated RF/analog/digital ground separation (RFGND, AGND, DGND) and integrated regulator decoupling (CREG, CVCO).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar UHF ASK/FSK transmitter applications.

Compared with SI4010-C2-GMR and CC1101RGPR, the ADF7011BRU-REEL7 offers superior frequency agility via its fractional-N PLL, lower system-level power consumption due to integrated regulation, and finer output power resolution (0.3125 dB), making it optimal for ETSI-compliant, battery-constrained ISM band transmitters.

Availability

ADF7011BRU-REEL7 is available at Aetrix Electronics and suitable for wireless metering, remote security systems, keyless entry, and industrial sensor networks requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for ADF7011BRU-REEL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and RF ICs, serving industrial, communications, and automotive markets with precision signal processing solutions.

The ADF7011 product line targets low-power, license-free ISM band wireless links, emphasizing integration, ETSI regulatory compliance, and ease of calibration for cost-sensitive consumer and industrial transmitters.

FAQ

What modulation schemes does the ADF7011BRU-REEL7 support?

The ADF7011BRU-REEL7 supports four modulation schemes: Binary FSK, Gaussian FSK (GFSK), Amplitude Shift Keying (ASK), and On/Off Keying (OOK). These are selected via the Modulation Register's two-bit scheme field (00=FSK, 01=GFSK, 10=ASK, 11=OOK). Each scheme has defined performance limits: FSK/GFSK supports up to 76.8 kbps, ASK up to 9.6 kbps, and OOK achieves 40 dB depth. The ADF7011BRU-REEL7 implements all modulation directly in hardware without external components.

What is the recommended loop filter design for ADF7011BRU-REEL7 in FSK applications?

For FSK operation, the ADF7011BRU-REEL7 requires a third-order integrator loop filter with bandwidth approximately five times the data rate. For example, at 19.2 kbps, a 100 kHz loop BW is recommended. This balances fast frequency settling (<23 µs for 26 MHz hop) against spurious attenuation. The loop filter integrates charge pump current (CPOUT) to generate VCO tuning voltage (VCOIN); component values must be calculated per Analog Devices' AN-1019 to meet phase noise and lock-detect timing specs. The ADF7011BRU-REEL7 datasheet provides a reference schematic in Figure 6.

How does the crystal compensation register function in ADF7011BRU-REEL7?

The crystal compensation register in the ADF7011BRU-REEL7 provides ±1 ppm resolution to correct frequency errors caused by crystal aging or temperature drift. It adjusts the R counter's divide ratio in the PLL feedback path, effectively shifting the reference input seen by the phase frequency detector. This allows indirect temperature compensation using a standard crystal instead of a TCXO, reducing BOM cost. The register is programmed via bits DB19–DB9 in the R register and is active only when the internal oscillator is enabled (XOE = 0).

What are the absolute maximum ratings for ADF7011BRU-REEL7 supply pins?

The ADF7011BRU-REEL7 has separate supply domains: DVDD (digital) and CPVDD (charge pump) both tolerate –0.3 V to +7 V relative to GND. The absolute maximum digital I/O voltage is –0.3 V to DVDD + 0.3 V. Exceeding these ratings risks permanent damage. Operation outside the functional range (2.3–3.6 V for DVDD/CPVDD) is not guaranteed. The device features ESD protection rated <1 kV HBM, requiring strict handling precautions per the caution notice in the datasheet.

Can ADF7011BRU-REEL7 operate with an external oscillator instead of a crystal?

Yes, the ADF7011BRU-REEL7 supports external oscillators from 3.4 MHz to 40 MHz applied to the OSC2 pin. When using an external source, the XOE bit in the Function Register must be set high to disable the internal crystal oscillator circuitry. OSC1 is three-stated in this mode. The external signal must meet CMOS logic thresholds (VINH ≥ 0.7×DVDD, VINL ≤ 0.2×DVDD) and drive capability sufficient for the 51 Ω termination recommended in the datasheet. This configuration bypasses crystal-related startup delays and compensation registers.